Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.92.9
1
7.18
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Fracture
Fibrous
Conchoidal
Cleavage
[010] Perfect, [100] Distinct, [011] Distinct
{???} Indistinct
Mohs Hardness
24.5
2
10
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Chemical Composition
Amethyst, Clear Quartz, Smoky Quartz, Cacoxenite, Rutile, Geothite, Lepidocrocite
(Zn,Cu)Al 6(PO 4) 4(OH) 8 · 4H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)